why are you demonizing us for it? it's time we had somebody who believes in us. someone who believes that achievement should be rewarded not punished. we need somebody who believes in america. [ romney ] i'm mitt romney and i approve this message. >>> welcome back to the international aids conference. i'm here in the global village. there's a performance going on. there's all kinds of sessions, scientific, advocacy. it was also chosen, the district, that is, because of the problem we have within the district of columbia with aids. it's no secret that we face an epidemic, but how does it compare to other cities and what's being done? i sat down with the d.c. department of health's top staff on hiv aids to find out. >> in d.c. we have two or three people infect every day. so it's a very serious epidemic. >> reporter: the senior deputy director says 3% of the district's population is infected with the virus that causes aids. dr. poppis says half of all people in the united states who are hiv positive live in 12 major cities. so d.c.'s woes are not unique. our number